Drill-extractor.



H. K. II/IAcKENZIE.

DRILL EXTRACTOR.

APPLICATION FILED SEPT- 16. I9I4.

Lmm. Patented OCI. 24,1916.

HARVEY KEITH MACKENZIE, OF KIIVIBERLEY, BRITISH COLUMBIA, CANADA.

DRILL-EXTRACTOR.

Specification of Letters Patent.

Patented @et 24, 19016.

Application filed September 16, 1914. Serial No. 862,033.

To all whom t may concern:

Se it known that I, HARVEY K. MACKEN- zin, a subject of England, and a resident of Kimberley, in the Province of British Columbia and Dominion of Canada, have invented a new and useful Improvement in Drill-Extractors, of which the following is a specification.

My invention is an improvement in drill extractors, and has for its object to provide a device of the character speciiied, adapted for use with power operated drills for extracting drill steels when jammed in the drill hole, and wherein the power of the drill is utilized for extracting the steel.

In the drawings z-Figure 1 is a side view of the improvement in use, Fig. 2 is a side view of a portion of the attachment with a part in section, Fig. 3 is a view of the said portion at right angles to Fig. 2, Fig. 4 is a perspective view of the link, and Fig. 5 is a similar view of the key.

The present embodiment of the invention is shown in connection with a power operated drill 1, of ordinary7 construction, having connected therewith the pressure supply pipe 2, which is controlled by a valve 3, arranged between the said pipe and the drill. The steel 4 is shown jammed in the drill hole, the said steel being cruciform in cross section.

A bar 5 having a portion of the length thereof cruciform in cross section as indicated at 6, is provided, the said bar having at the opposite end from the cruciform portion a transverse pin l?, whose ends extend beyond the opposite faces of the bar. Between the pin and the cruciform portion the bar is provided with a pair of shoulders 8 and 9, the said shoulders facing in opposite directions.

The shoulder 8 is adjacent to the pin 7 and at one edge of the bar while the shoulder 9 is at the opposite edge. The two shoulders are beveled in the same direction, and their faces are parallel. The bar is adapted to be inserted in the chuck of the drill, the cruciform portion being engaged with the chuck, the said portion being of approximately the same shape and size as the drill stem.

A link is used in connection with the bar, the link being shown in Fig. 4. This link 10 is provided at one end with a slot 11, for receiving the upper end of the bar 5, the slot however, being of greater length than the width of the plain portion of the bar. The slot is of approximately the same width as the thickness of the bar, so that it may be easily inserted over the plain end of the bar when the bar is held in the chuck.

At the opposite end the link is provided with an eye or loop 12, and one end of a cable 13 is engaged with the eye, the end of the cable being passed through the eye and being then secured to the body of the cable, as indicated at 14. A key 15 is used in connection with the drill steel, the key having at one end a head 16, provided with a transverse .opening 17 of cruciform cross section and shaped to iit the drill steel.

Between the head and the body of the key a perforated lug 18 is provided on the upper face of the key. This lug is adapted for engagement by the opposite end of the cable 13 from the link 10, as clearly shown in Fig. 1. The end of the cable is passed through the perforated lug and a clamp 19 is provided for clamping the said end to the body of the cable.

The operation of the improvement is as follows -lVhen a drill steel becomes jammed in the drill hole, the bar 5 is in-A serted in the chuck of the drill, the cruciform portion being engaged with the chuck. The drill is then reversed, and the rod or peg Q0 of the feed cylinder is inserted in an opening in the ground close to the drill steel. The key 15 is then engaged with the steel, the steel being passed through the cruciform opening of the head. The link 10 islnormally connected with the bar 5 in the man* ner shown in Figs. 1 and 2, the pin 7 preventing disengagement of the link. The shoulders 8 and 9 are beveled in such man ner that when the link is in place it will rest as shown in Fig. 2, engaging both shoulders throughout their extent, the under face of the link at one end of the opening 11 engaging one shoulder and the upper face of the link at the opposite end of the opening` engaging the other. The cable 13 which is normally connected with the eye of the link, is now connected with the key, the end being passed through the perforation and being then clamped to the body of the cable. With the parts in this position, the motive fluid is admitted to the drill. As the hammer f the drill reciprocates, the bar 5 will be struck and will make traction on the cable 13, thus jarring the drill steel through the key 15. At the same time the v feed mechanism will make steady continuous traction on the cable 13 in the direction of its length, and it will be evident thatbut little time Awill be required to loosen the drill wherein steady traction and intermediate jarring are used together. The key may also be utilized for rotating the drill if desired.

It will be understood that the improvement 'may also be used to remove a bit with a. steady pull, and without operating the hammer.l As for instance, when the bit sticks Vin a muddy hole, the link l() is permitted to slip down over the shoulder 9 until it rests upon the shoulder formed by the ciuciforni portion of the bar 5. This permits the bar 5 being inserted but a short distance into the chuck of the drill and with the bar in this position the hammer of the drill will not operate, that is, it will not strike the bar 5. The feeding mechanism 0f the drill'is now started and the bar 5 will be moved away from the key steadily without any jerking or jarring. Hence ther pull is `a steady pull without arring.

I claim l. A. drill extractor to be used in connection with a power drill, and comprising a key having an opening in one end shaped to fit and receive the drill stem, a bar having one end adapted to fit within the chuck of the drill, said bar having pairs of oppositely arranged stops at the opposite end and spaced apartfrom each other longitudinally of the bar, a link having an opening at one end for receiving the said end ofthe bar 2. A drill extractor. for use in connection with a .power drill, and comprising a key having an opening in one end for receiving the drill-stem, a bar having one end shaped to lit within the chuck of the drill, a link having an opening for receiving the other end of the bar when the bar is in place in the drill, a fiexible connection between the key and the link, and a plurality of stops in c onnection with the bar for engagement by opening for engaging the said end of the bar, said bar having a plurality of stops for engagement by the link to limit the movement thereof toward the chuck, and the stops being spaced apart longitudinally of the bar, and a flexible connection between the link and the key intermediate the ends of the key and of sufficient length to permit the feed rod of the drill to be engaged with the surface in which the drill stein is held with the bar in place in the chuck.

4. In combination with a power drill having feed mechanism, of a. drill extractor comprising a key having an opening for receiving the stem at one end of the key, a bar adapted to it within the chuck of the drill at one end and to extend beyond the chuck at the other end, a link having an opening for engaging the said end of the bar, said bar having a stop for engagement by the link to limit the movement thereof toward the chuck, and a connection between the link and the key intermediate the ends of the key and 0f sufficient length to permit the drill to be reversed with the feed rod contacting with the surface engaged by the drill stem with the bar in place in the chuck.

HARVEY KEITH MACKENZIE.

Witnesses:

D. G. EVANS, R. INCHES.

Copies of this patent may be obtainedV for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

